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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: Session.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.jsimpledb.core.Database;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import org.jsimpledb.core.Schema;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import org.jsimpledb.core.Transaction;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import org.jsimpledb.schema.NameIndex;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.jsimpledb.schema.SchemaModel;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.slf4j.Logger;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.slf4j.LoggerFactory;<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>/**<a name="line.18"></a>
<span class="sourceLineNo">019</span> * Utility class for programmatic {@link JSimpleDB} database access.<a name="line.19"></a>
<span class="sourceLineNo">020</span> *<a name="line.20"></a>
<span class="sourceLineNo">021</span> * &lt;p&gt;<a name="line.21"></a>
<span class="sourceLineNo">022</span> * Instances operate in one of two modes, either &lt;b&gt;JSimpleDB&lt;/b&gt; mode or &lt;b&gt;core API&lt;/b&gt; mode.<a name="line.22"></a>
<span class="sourceLineNo">023</span> * In the latter mode, no Java model classes are required and only the core API may be used.<a name="line.23"></a>
<span class="sourceLineNo">024</span> * Of course the core API can also be used in JSimpleDB mode.<a name="line.24"></a>
<span class="sourceLineNo">025</span> * &lt;/p&gt;<a name="line.25"></a>
<span class="sourceLineNo">026</span> *<a name="line.26"></a>
<span class="sourceLineNo">027</span> * &lt;p&gt;<a name="line.27"></a>
<span class="sourceLineNo">028</span> * This class is not thread safe.<a name="line.28"></a>
<span class="sourceLineNo">029</span> * &lt;/p&gt;<a name="line.29"></a>
<span class="sourceLineNo">030</span> */<a name="line.30"></a>
<span class="sourceLineNo">031</span>public class Session {<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>    protected final Logger log = LoggerFactory.getLogger(this.getClass());<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>    private final JSimpleDB jdb;<a name="line.35"></a>
<span class="sourceLineNo">036</span>    private final Database db;<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    private Transaction tx;<a name="line.38"></a>
<span class="sourceLineNo">039</span>    private SchemaModel schemaModel;<a name="line.39"></a>
<span class="sourceLineNo">040</span>    private ValidationMode validationMode;<a name="line.40"></a>
<span class="sourceLineNo">041</span>    private NameIndex nameIndex;<a name="line.41"></a>
<span class="sourceLineNo">042</span>    private String databaseDescription;<a name="line.42"></a>
<span class="sourceLineNo">043</span>    private int schemaVersion;<a name="line.43"></a>
<span class="sourceLineNo">044</span>    private boolean allowNewSchema;<a name="line.44"></a>
<span class="sourceLineNo">045</span>    private boolean readOnly;<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>// Constructors<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>    /**<a name="line.49"></a>
<span class="sourceLineNo">050</span>     * Constructor for core API level access.<a name="line.50"></a>
<span class="sourceLineNo">051</span>     *<a name="line.51"></a>
<span class="sourceLineNo">052</span>     * @param db core database<a name="line.52"></a>
<span class="sourceLineNo">053</span>     * @throws IllegalArgumentException if {@code db} is null<a name="line.53"></a>
<span class="sourceLineNo">054</span>     */<a name="line.54"></a>
<span class="sourceLineNo">055</span>    public Session(Database db) {<a name="line.55"></a>
<span class="sourceLineNo">056</span>        this(null, db);<a name="line.56"></a>
<span class="sourceLineNo">057</span>    }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>    /**<a name="line.59"></a>
<span class="sourceLineNo">060</span>     * Constructor for {@link JSimpleDB} level access.<a name="line.60"></a>
<span class="sourceLineNo">061</span>     *<a name="line.61"></a>
<span class="sourceLineNo">062</span>     * @param jdb database<a name="line.62"></a>
<span class="sourceLineNo">063</span>     * @throws IllegalArgumentException if {@code jdb} is null<a name="line.63"></a>
<span class="sourceLineNo">064</span>     */<a name="line.64"></a>
<span class="sourceLineNo">065</span>    public Session(JSimpleDB jdb) {<a name="line.65"></a>
<span class="sourceLineNo">066</span>        this(jdb, jdb.getDatabase());<a name="line.66"></a>
<span class="sourceLineNo">067</span>    }<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>    private Session(JSimpleDB jdb, Database db) {<a name="line.69"></a>
<span class="sourceLineNo">070</span>        if (db == null)<a name="line.70"></a>
<span class="sourceLineNo">071</span>            throw new IllegalArgumentException("null db");<a name="line.71"></a>
<span class="sourceLineNo">072</span>        this.jdb = jdb;<a name="line.72"></a>
<span class="sourceLineNo">073</span>        this.db = db;<a name="line.73"></a>
<span class="sourceLineNo">074</span>    }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>// Accessors<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span>    /**<a name="line.78"></a>
<span class="sourceLineNo">079</span>     * Get the associated {@link JSimpleDB}, if any.<a name="line.79"></a>
<span class="sourceLineNo">080</span>     *<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * @return the associated {@link JSimpleDB} or null if this instance is in core API mode.<a name="line.81"></a>
<span class="sourceLineNo">082</span>     */<a name="line.82"></a>
<span class="sourceLineNo">083</span>    public JSimpleDB getJSimpleDB() {<a name="line.83"></a>
<span class="sourceLineNo">084</span>        return this.jdb;<a name="line.84"></a>
<span class="sourceLineNo">085</span>    }<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span>    /**<a name="line.87"></a>
<span class="sourceLineNo">088</span>     * Determine if this instance has an associated {@link JSimpleDB}.<a name="line.88"></a>
<span class="sourceLineNo">089</span>     * If so it is in JSimpleDB mode, otherwise it's in core API mode.<a name="line.89"></a>
<span class="sourceLineNo">090</span>     *<a name="line.90"></a>
<span class="sourceLineNo">091</span>     * @return true if this session is in JSimpleDB mode, false if in core API mode<a name="line.91"></a>
<span class="sourceLineNo">092</span>     */<a name="line.92"></a>
<span class="sourceLineNo">093</span>    public boolean hasJSimpleDB() {<a name="line.93"></a>
<span class="sourceLineNo">094</span>        return this.jdb != null;<a name="line.94"></a>
<span class="sourceLineNo">095</span>    }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>    /**<a name="line.97"></a>
<span class="sourceLineNo">098</span>     * Get the associated {@link Database}.<a name="line.98"></a>
<span class="sourceLineNo">099</span>     *<a name="line.99"></a>
<span class="sourceLineNo">100</span>     * @return the associated {@link Database}<a name="line.100"></a>
<span class="sourceLineNo">101</span>     */<a name="line.101"></a>
<span class="sourceLineNo">102</span>    public Database getDatabase() {<a name="line.102"></a>
<span class="sourceLineNo">103</span>        return this.db;<a name="line.103"></a>
<span class="sourceLineNo">104</span>    }<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span>    /**<a name="line.106"></a>
<span class="sourceLineNo">107</span>     * Get the {@link Transaction} currently associated with this instance.<a name="line.107"></a>
<span class="sourceLineNo">108</span>     * This will be null unless {@link #perform perform()} is currently being invoked.<a name="line.108"></a>
<span class="sourceLineNo">109</span>     *<a name="line.109"></a>
<span class="sourceLineNo">110</span>     * @return the associated {@link Database}<a name="line.110"></a>
<span class="sourceLineNo">111</span>     */<a name="line.111"></a>
<span class="sourceLineNo">112</span>    public Transaction getTransaction() {<a name="line.112"></a>
<span class="sourceLineNo">113</span>        if (this.tx == null)<a name="line.113"></a>
<span class="sourceLineNo">114</span>            throw new IllegalStateException("no transaction associated with session");<a name="line.114"></a>
<span class="sourceLineNo">115</span>        return this.tx;<a name="line.115"></a>
<span class="sourceLineNo">116</span>    }<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span>    /**<a name="line.118"></a>
<span class="sourceLineNo">119</span>     * Get the {@link SchemaModel} configured for this instance.<a name="line.119"></a>
<span class="sourceLineNo">120</span>     * If this is left unconfigured, after the first transaction it will be updated with the schema model actually used.<a name="line.120"></a>
<span class="sourceLineNo">121</span>     *<a name="line.121"></a>
<span class="sourceLineNo">122</span>     * @return the schema model used by this session<a name="line.122"></a>
<span class="sourceLineNo">123</span>     */<a name="line.123"></a>
<span class="sourceLineNo">124</span>    public SchemaModel getSchemaModel() {<a name="line.124"></a>
<span class="sourceLineNo">125</span>        return this.schemaModel;<a name="line.125"></a>
<span class="sourceLineNo">126</span>    }<a name="line.126"></a>
<span class="sourceLineNo">127</span>    public void setSchemaModel(SchemaModel schemaModel) {<a name="line.127"></a>
<span class="sourceLineNo">128</span>        this.schemaModel = schemaModel;<a name="line.128"></a>
<span class="sourceLineNo">129</span>        this.nameIndex = this.schemaModel != null ? new NameIndex(this.schemaModel) : null;<a name="line.129"></a>
<span class="sourceLineNo">130</span>    }<a name="line.130"></a>
<span class="sourceLineNo">131</span><a name="line.131"></a>
<span class="sourceLineNo">132</span>    /**<a name="line.132"></a>
<span class="sourceLineNo">133</span>     * Get the {@link NameIndex} for this instance's {@link SchemaModel}.<a name="line.133"></a>
<span class="sourceLineNo">134</span>     *<a name="line.134"></a>
<span class="sourceLineNo">135</span>     * @return name index for the schema model assumed by this session<a name="line.135"></a>
<span class="sourceLineNo">136</span>     */<a name="line.136"></a>
<span class="sourceLineNo">137</span>    public NameIndex getNameIndex() {<a name="line.137"></a>
<span class="sourceLineNo">138</span>        return this.nameIndex != null ? this.nameIndex : new NameIndex(new SchemaModel());<a name="line.138"></a>
<span class="sourceLineNo">139</span>    }<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span>    /**<a name="line.141"></a>
<span class="sourceLineNo">142</span>     * Get a description of the database.<a name="line.142"></a>
<span class="sourceLineNo">143</span>     *<a name="line.143"></a>
<span class="sourceLineNo">144</span>     * @return a short description of the underlying database<a name="line.144"></a>
<span class="sourceLineNo">145</span>     */<a name="line.145"></a>
<span class="sourceLineNo">146</span>    public String getDatabaseDescription() {<a name="line.146"></a>
<span class="sourceLineNo">147</span>        return this.databaseDescription;<a name="line.147"></a>
<span class="sourceLineNo">148</span>    }<a name="line.148"></a>
<span class="sourceLineNo">149</span>    public void setDatabaseDescription(String databaseDescription) {<a name="line.149"></a>
<span class="sourceLineNo">150</span>        this.databaseDescription = databaseDescription;<a name="line.150"></a>
<span class="sourceLineNo">151</span>    }<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span>    /**<a name="line.153"></a>
<span class="sourceLineNo">154</span>     * Get the schema version associated with this instance.<a name="line.154"></a>
<span class="sourceLineNo">155</span>     * If this is left unconfigured, the highest numbered schema version will be<a name="line.155"></a>
<span class="sourceLineNo">156</span>     * used and after the first transaction this property will be updated accordingly.<a name="line.156"></a>
<span class="sourceLineNo">157</span>     *<a name="line.157"></a>
<span class="sourceLineNo">158</span>     * @return the schema version used by this session<a name="line.158"></a>
<span class="sourceLineNo">159</span>     */<a name="line.159"></a>
<span class="sourceLineNo">160</span>    public int getSchemaVersion() {<a name="line.160"></a>
<span class="sourceLineNo">161</span>        return this.schemaVersion;<a name="line.161"></a>
<span class="sourceLineNo">162</span>    }<a name="line.162"></a>
<span class="sourceLineNo">163</span>    public void setSchemaVersion(int schemaVersion) {<a name="line.163"></a>
<span class="sourceLineNo">164</span>        this.schemaVersion = schemaVersion;<a name="line.164"></a>
<span class="sourceLineNo">165</span>    }<a name="line.165"></a>
<span class="sourceLineNo">166</span><a name="line.166"></a>
<span class="sourceLineNo">167</span>    /**<a name="line.167"></a>
<span class="sourceLineNo">168</span>     * Get the {@link ValidationMode} associated with this instance.<a name="line.168"></a>
<span class="sourceLineNo">169</span>     * This property is only relevant in {@link JSimpleDB} mode.<a name="line.169"></a>
<span class="sourceLineNo">170</span>     * If this is left unconfigured, {@link ValidationMode#AUTOMATIC} is used for new transactions.<a name="line.170"></a>
<span class="sourceLineNo">171</span>     *<a name="line.171"></a>
<span class="sourceLineNo">172</span>     * @return the validation mode used by this session<a name="line.172"></a>
<span class="sourceLineNo">173</span>     */<a name="line.173"></a>
<span class="sourceLineNo">174</span>    public ValidationMode getValidationMode() {<a name="line.174"></a>
<span class="sourceLineNo">175</span>        return this.validationMode;<a name="line.175"></a>
<span class="sourceLineNo">176</span>    }<a name="line.176"></a>
<span class="sourceLineNo">177</span>    public void setValidationMode(ValidationMode validationMode) {<a name="line.177"></a>
<span class="sourceLineNo">178</span>        this.validationMode = validationMode;<a name="line.178"></a>
<span class="sourceLineNo">179</span>    }<a name="line.179"></a>
<span class="sourceLineNo">180</span><a name="line.180"></a>
<span class="sourceLineNo">181</span>    /**<a name="line.181"></a>
<span class="sourceLineNo">182</span>     * Get whether the recording of new schema versions should be allowed.<a name="line.182"></a>
<span class="sourceLineNo">183</span>     * Default value is false.<a name="line.183"></a>
<span class="sourceLineNo">184</span>     *<a name="line.184"></a>
<span class="sourceLineNo">185</span>     * @return whether this session allows recording a new schema version<a name="line.185"></a>
<span class="sourceLineNo">186</span>     */<a name="line.186"></a>
<span class="sourceLineNo">187</span>    public boolean isAllowNewSchema() {<a name="line.187"></a>
<span class="sourceLineNo">188</span>        return this.allowNewSchema;<a name="line.188"></a>
<span class="sourceLineNo">189</span>    }<a name="line.189"></a>
<span class="sourceLineNo">190</span>    public void setAllowNewSchema(boolean allowNewSchema) {<a name="line.190"></a>
<span class="sourceLineNo">191</span>        this.allowNewSchema = allowNewSchema;<a name="line.191"></a>
<span class="sourceLineNo">192</span>    }<a name="line.192"></a>
<span class="sourceLineNo">193</span><a name="line.193"></a>
<span class="sourceLineNo">194</span>    /**<a name="line.194"></a>
<span class="sourceLineNo">195</span>     * Get whether new transactions should be marked read-only.<a name="line.195"></a>
<span class="sourceLineNo">196</span>     * Default value is false.<a name="line.196"></a>
<span class="sourceLineNo">197</span>     *<a name="line.197"></a>
<span class="sourceLineNo">198</span>     * @return whether this session creates read-only transactions<a name="line.198"></a>
<span class="sourceLineNo">199</span>     */<a name="line.199"></a>
<span class="sourceLineNo">200</span>    public boolean isReadOnly() {<a name="line.200"></a>
<span class="sourceLineNo">201</span>        return this.readOnly;<a name="line.201"></a>
<span class="sourceLineNo">202</span>    }<a name="line.202"></a>
<span class="sourceLineNo">203</span>    public void setReadOnly(boolean readOnly) {<a name="line.203"></a>
<span class="sourceLineNo">204</span>        this.readOnly = readOnly;<a name="line.204"></a>
<span class="sourceLineNo">205</span>    }<a name="line.205"></a>
<span class="sourceLineNo">206</span><a name="line.206"></a>
<span class="sourceLineNo">207</span>// Errors<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span>    /**<a name="line.209"></a>
<span class="sourceLineNo">210</span>     * Handle an exception thrown during an invocation of {@link #perform perform()}.<a name="line.210"></a>
<span class="sourceLineNo">211</span>     *<a name="line.211"></a>
<span class="sourceLineNo">212</span>     * &lt;p&gt;<a name="line.212"></a>
<span class="sourceLineNo">213</span>     * The implementation in {@code Session} logs an error message. Subclasses are encouraged to<a name="line.213"></a>
<span class="sourceLineNo">214</span>     * handle errors more gracefully within the context of the associated application.<a name="line.214"></a>
<span class="sourceLineNo">215</span>     * &lt;/p&gt;<a name="line.215"></a>
<span class="sourceLineNo">216</span>     *<a name="line.216"></a>
<span class="sourceLineNo">217</span>     * @param e exception thrown during {@link #perform perform()}<a name="line.217"></a>
<span class="sourceLineNo">218</span>     */<a name="line.218"></a>
<span class="sourceLineNo">219</span>    protected void reportException(Exception e) {<a name="line.219"></a>
<span class="sourceLineNo">220</span>        this.log.error("exception within session", e);<a name="line.220"></a>
<span class="sourceLineNo">221</span>    }<a name="line.221"></a>
<span class="sourceLineNo">222</span><a name="line.222"></a>
<span class="sourceLineNo">223</span>// Transactions<a name="line.223"></a>
<span class="sourceLineNo">224</span><a name="line.224"></a>
<span class="sourceLineNo">225</span>    /**<a name="line.225"></a>
<span class="sourceLineNo">226</span>     * Perform the given action. This is a convenience method, equivalent to: {@code perform(null, action)}<a name="line.226"></a>
<span class="sourceLineNo">227</span>     *<a name="line.227"></a>
<span class="sourceLineNo">228</span>     * @param action action to perform<a name="line.228"></a>
<span class="sourceLineNo">229</span>     * @return true if {@code action} completed successfully, false if the transaction could not be created<a name="line.229"></a>
<span class="sourceLineNo">230</span>     *  or {@code action} threw an exception<a name="line.230"></a>
<span class="sourceLineNo">231</span>     * @throws IllegalArgumentException if {@code action} is null<a name="line.231"></a>
<span class="sourceLineNo">232</span>     */<a name="line.232"></a>
<span class="sourceLineNo">233</span>    public boolean perform(Action action) {<a name="line.233"></a>
<span class="sourceLineNo">234</span>        return this.perform(null, action);<a name="line.234"></a>
<span class="sourceLineNo">235</span>    }<a name="line.235"></a>
<span class="sourceLineNo">236</span><a name="line.236"></a>
<span class="sourceLineNo">237</span>    /**<a name="line.237"></a>
<span class="sourceLineNo">238</span>     * Perform the given action within the given existing transaction, if any, otherwise within a new transaction.<a name="line.238"></a>
<span class="sourceLineNo">239</span>     * If {@code tx} is not null, it will used and left open when this method returns. Otherwise, if there is already<a name="line.239"></a>
<span class="sourceLineNo">240</span>     * an open transaction associated with this instance, or else the current thread, it will be used and left open when<a name="line.240"></a>
<span class="sourceLineNo">241</span>     * this method returns; otherwise, a new transaction is created for the duration of {@code action} and then committed.<a name="line.241"></a>
<span class="sourceLineNo">242</span>     *<a name="line.242"></a>
<span class="sourceLineNo">243</span>     * &lt;p&gt;<a name="line.243"></a>
<span class="sourceLineNo">244</span>     * If {@code tx} is not null and there is already an open transaction associated with this instance and they<a name="line.244"></a>
<span class="sourceLineNo">245</span>     * are not the same transaction, an {@link IllegalStateException} is thrown.<a name="line.245"></a>
<span class="sourceLineNo">246</span>     * &lt;/p&gt;<a name="line.246"></a>
<span class="sourceLineNo">247</span>     *<a name="line.247"></a>
<span class="sourceLineNo">248</span>     * &lt;p&gt;<a name="line.248"></a>
<span class="sourceLineNo">249</span>     * If {@code action} throws an {@link Exception}, it will be caught and handled by {@link #reportException reportException()}<a name="line.249"></a>
<span class="sourceLineNo">250</span>     * and then false returned.<a name="line.250"></a>
<span class="sourceLineNo">251</span>     * &lt;/p&gt;<a name="line.251"></a>
<span class="sourceLineNo">252</span>     *<a name="line.252"></a>
<span class="sourceLineNo">253</span>     * @param tx transaction in which to perform the action, or null to create a new one (if necessary)<a name="line.253"></a>
<span class="sourceLineNo">254</span>     * @param action action to perform<a name="line.254"></a>
<span class="sourceLineNo">255</span>     * @return true if {@code action} completed successfully, false if the transaction could not be created<a name="line.255"></a>
<span class="sourceLineNo">256</span>     *  or {@code action} threw an exception<a name="line.256"></a>
<span class="sourceLineNo">257</span>     * @throws IllegalStateException if {@code tx} conflict with the already an open transaction associated with this instance<a name="line.257"></a>
<span class="sourceLineNo">258</span>     * @throws IllegalArgumentException if {@code action} is null<a name="line.258"></a>
<span class="sourceLineNo">259</span>     */<a name="line.259"></a>
<span class="sourceLineNo">260</span>    public boolean perform(Transaction tx, final Action action) {<a name="line.260"></a>
<span class="sourceLineNo">261</span><a name="line.261"></a>
<span class="sourceLineNo">262</span>        // Sanity check<a name="line.262"></a>
<span class="sourceLineNo">263</span>        if (action == null)<a name="line.263"></a>
<span class="sourceLineNo">264</span>            throw new IllegalArgumentException("null action");<a name="line.264"></a>
<span class="sourceLineNo">265</span>        if (tx != null &amp;&amp; this.tx != null &amp;&amp; tx != this.tx)<a name="line.265"></a>
<span class="sourceLineNo">266</span>            throw new IllegalStateException("a transaction is already open in this session");<a name="line.266"></a>
<span class="sourceLineNo">267</span><a name="line.267"></a>
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<span class="sourceLineNo">274</span>            else if (this.jdb == null)<a name="line.274"></a>
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<span class="sourceLineNo">278</span>                if (jtx == null)<a name="line.278"></a>
<span class="sourceLineNo">279</span>                    newTransaction = true;<a name="line.279"></a>
<span class="sourceLineNo">280</span>                else {<a name="line.280"></a>
<span class="sourceLineNo">281</span>                    tx = jtx.getTransaction();<a name="line.281"></a>
<span class="sourceLineNo">282</span>                    newTransaction = false;<a name="line.282"></a>
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<span class="sourceLineNo">284</span>            }<a name="line.284"></a>
<span class="sourceLineNo">285</span>            if (newTransaction) {<a name="line.285"></a>
<span class="sourceLineNo">286</span>                if (!this.openTransaction())<a name="line.286"></a>
<span class="sourceLineNo">287</span>                    return false;<a name="line.287"></a>
<span class="sourceLineNo">288</span>            } else if (this.tx == null)<a name="line.288"></a>
<span class="sourceLineNo">289</span>                this.tx = tx;<a name="line.289"></a>
<span class="sourceLineNo">290</span>            boolean success = false;<a name="line.290"></a>
<span class="sourceLineNo">291</span>            try {<a name="line.291"></a>
<span class="sourceLineNo">292</span>                action.run(this);<a name="line.292"></a>
<span class="sourceLineNo">293</span>                success = true;<a name="line.293"></a>
<span class="sourceLineNo">294</span>            } finally {<a name="line.294"></a>
<span class="sourceLineNo">295</span>                if (newTransaction &amp;&amp; this.tx != null) {<a name="line.295"></a>
<span class="sourceLineNo">296</span>                    if (success)<a name="line.296"></a>
<span class="sourceLineNo">297</span>                        success = this.commitTransaction();<a name="line.297"></a>
<span class="sourceLineNo">298</span>                    else<a name="line.298"></a>
<span class="sourceLineNo">299</span>                        this.rollbackTransaction();<a name="line.299"></a>
<span class="sourceLineNo">300</span>                }<a name="line.300"></a>
<span class="sourceLineNo">301</span>            }<a name="line.301"></a>
<span class="sourceLineNo">302</span>            return success;<a name="line.302"></a>
<span class="sourceLineNo">303</span>        } catch (Exception e) {<a name="line.303"></a>
<span class="sourceLineNo">304</span>            this.reportException(e);<a name="line.304"></a>
<span class="sourceLineNo">305</span>            return false;<a name="line.305"></a>
<span class="sourceLineNo">306</span>        } finally {<a name="line.306"></a>
<span class="sourceLineNo">307</span>            this.tx = previousTransaction;<a name="line.307"></a>
<span class="sourceLineNo">308</span>        }<a name="line.308"></a>
<span class="sourceLineNo">309</span>    }<a name="line.309"></a>
<span class="sourceLineNo">310</span><a name="line.310"></a>
<span class="sourceLineNo">311</span>    private boolean openTransaction() {<a name="line.311"></a>
<span class="sourceLineNo">312</span>        try {<a name="line.312"></a>
<span class="sourceLineNo">313</span>            if (this.tx != null)<a name="line.313"></a>
<span class="sourceLineNo">314</span>                throw new IllegalStateException("a transaction is already open in this session");<a name="line.314"></a>
<span class="sourceLineNo">315</span>            if (this.jdb != null) {<a name="line.315"></a>
<span class="sourceLineNo">316</span>                if (this.getCurrentJTransaction() != null)<a name="line.316"></a>
<span class="sourceLineNo">317</span>                    throw new IllegalStateException("a JSimpleDB transaction is already open in the current thread");<a name="line.317"></a>
<span class="sourceLineNo">318</span>                final JTransaction jtx = this.jdb.createTransaction(this.allowNewSchema,<a name="line.318"></a>
<span class="sourceLineNo">319</span>                  validationMode != null ? validationMode : ValidationMode.AUTOMATIC);<a name="line.319"></a>
<span class="sourceLineNo">320</span>                JTransaction.setCurrent(jtx);<a name="line.320"></a>
<span class="sourceLineNo">321</span>                this.tx = jtx.getTransaction();<a name="line.321"></a>
<span class="sourceLineNo">322</span>            } else<a name="line.322"></a>
<span class="sourceLineNo">323</span>                this.tx = this.db.createTransaction(this.schemaModel, this.schemaVersion, this.allowNewSchema);<a name="line.323"></a>
<span class="sourceLineNo">324</span>            final Schema schema = this.tx.getSchema();<a name="line.324"></a>
<span class="sourceLineNo">325</span>            this.setSchemaModel(schema.getSchemaModel());<a name="line.325"></a>
<span class="sourceLineNo">326</span>            this.setSchemaVersion(schema.getVersionNumber());<a name="line.326"></a>
<span class="sourceLineNo">327</span>            this.tx.setReadOnly(this.readOnly);<a name="line.327"></a>
<span class="sourceLineNo">328</span>            return true;<a name="line.328"></a>
<span class="sourceLineNo">329</span>        } catch (Exception e) {<a name="line.329"></a>
<span class="sourceLineNo">330</span>            this.tx = null;<a name="line.330"></a>
<span class="sourceLineNo">331</span>            this.reportException(e);<a name="line.331"></a>
<span class="sourceLineNo">332</span>            return false;<a name="line.332"></a>
<span class="sourceLineNo">333</span>        }<a name="line.333"></a>
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<span class="sourceLineNo">335</span><a name="line.335"></a>
<span class="sourceLineNo">336</span>    private boolean commitTransaction() {<a name="line.336"></a>
<span class="sourceLineNo">337</span>        try {<a name="line.337"></a>
<span class="sourceLineNo">338</span>            if (this.tx == null)<a name="line.338"></a>
<span class="sourceLineNo">339</span>                throw new IllegalStateException("no transaction");<a name="line.339"></a>
<span class="sourceLineNo">340</span>            if (this.jdb != null)<a name="line.340"></a>
<span class="sourceLineNo">341</span>                JTransaction.getCurrent().commit();<a name="line.341"></a>
<span class="sourceLineNo">342</span>            else<a name="line.342"></a>
<span class="sourceLineNo">343</span>                this.tx.commit();<a name="line.343"></a>
<span class="sourceLineNo">344</span>            return true;<a name="line.344"></a>
<span class="sourceLineNo">345</span>        } catch (Exception e) {<a name="line.345"></a>
<span class="sourceLineNo">346</span>            this.reportException(e);<a name="line.346"></a>
<span class="sourceLineNo">347</span>            return false;<a name="line.347"></a>
<span class="sourceLineNo">348</span>        } finally {<a name="line.348"></a>
<span class="sourceLineNo">349</span>            this.tx = null;<a name="line.349"></a>
<span class="sourceLineNo">350</span>            if (this.jdb != null)<a name="line.350"></a>
<span class="sourceLineNo">351</span>                JTransaction.setCurrent(null);<a name="line.351"></a>
<span class="sourceLineNo">352</span>        }<a name="line.352"></a>
<span class="sourceLineNo">353</span>    }<a name="line.353"></a>
<span class="sourceLineNo">354</span><a name="line.354"></a>
<span class="sourceLineNo">355</span>    private boolean rollbackTransaction() {<a name="line.355"></a>
<span class="sourceLineNo">356</span>        try {<a name="line.356"></a>
<span class="sourceLineNo">357</span>            if (this.tx == null)<a name="line.357"></a>
<span class="sourceLineNo">358</span>                throw new IllegalStateException("no transaction");<a name="line.358"></a>
<span class="sourceLineNo">359</span>            if (this.jdb != null)<a name="line.359"></a>
<span class="sourceLineNo">360</span>                JTransaction.getCurrent().rollback();<a name="line.360"></a>
<span class="sourceLineNo">361</span>            else<a name="line.361"></a>
<span class="sourceLineNo">362</span>                this.tx.rollback();<a name="line.362"></a>
<span class="sourceLineNo">363</span>            return true;<a name="line.363"></a>
<span class="sourceLineNo">364</span>        } catch (Exception e) {<a name="line.364"></a>
<span class="sourceLineNo">365</span>            this.reportException(e);<a name="line.365"></a>
<span class="sourceLineNo">366</span>            return false;<a name="line.366"></a>
<span class="sourceLineNo">367</span>        } finally {<a name="line.367"></a>
<span class="sourceLineNo">368</span>            this.tx = null;<a name="line.368"></a>
<span class="sourceLineNo">369</span>            if (this.jdb != null)<a name="line.369"></a>
<span class="sourceLineNo">370</span>                JTransaction.setCurrent(null);<a name="line.370"></a>
<span class="sourceLineNo">371</span>        }<a name="line.371"></a>
<span class="sourceLineNo">372</span>    }<a name="line.372"></a>
<span class="sourceLineNo">373</span><a name="line.373"></a>
<span class="sourceLineNo">374</span>    private JTransaction getCurrentJTransaction() {<a name="line.374"></a>
<span class="sourceLineNo">375</span>        try {<a name="line.375"></a>
<span class="sourceLineNo">376</span>            return JTransaction.getCurrent();<a name="line.376"></a>
<span class="sourceLineNo">377</span>        } catch (IllegalStateException e) {<a name="line.377"></a>
<span class="sourceLineNo">378</span>            return null;<a name="line.378"></a>
<span class="sourceLineNo">379</span>        }<a name="line.379"></a>
<span class="sourceLineNo">380</span>    }<a name="line.380"></a>
<span class="sourceLineNo">381</span><a name="line.381"></a>
<span class="sourceLineNo">382</span>// Action<a name="line.382"></a>
<span class="sourceLineNo">383</span><a name="line.383"></a>
<span class="sourceLineNo">384</span>    /**<a name="line.384"></a>
<span class="sourceLineNo">385</span>     * Callback interface used by {@link Session#perform Session.perform()}.<a name="line.385"></a>
<span class="sourceLineNo">386</span>     */<a name="line.386"></a>
<span class="sourceLineNo">387</span>    public interface Action {<a name="line.387"></a>
<span class="sourceLineNo">388</span><a name="line.388"></a>
<span class="sourceLineNo">389</span>        /**<a name="line.389"></a>
<span class="sourceLineNo">390</span>         * Perform some action using the given {@link Session} while a transaction is open.<a name="line.390"></a>
<span class="sourceLineNo">391</span>         *<a name="line.391"></a>
<span class="sourceLineNo">392</span>         * @param session session with open transaction<a name="line.392"></a>
<span class="sourceLineNo">393</span>         * @throws Exception if an error occurs<a name="line.393"></a>
<span class="sourceLineNo">394</span>         */<a name="line.394"></a>
<span class="sourceLineNo">395</span>        void run(Session session) throws Exception;<a name="line.395"></a>
<span class="sourceLineNo">396</span>    }<a name="line.396"></a>
<span class="sourceLineNo">397</span>}<a name="line.397"></a>
<span class="sourceLineNo">398</span><a name="line.398"></a>




























































</pre>
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